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Easier subsampling with xSub == 1 as no-op

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Harald Kuhr
2021-03-27 14:37:33 +01:00
parent 3b34d6e7ce
commit bb650e5280
4 changed files with 59 additions and 40 deletions
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21
imageio/imageio-core/src/main/java/com/twelvemonkeys/imageio/util/IIOUtil.java
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@@ -223,7 +223,12 @@ public final class IIOUtil {
public static void subsampleRow(byte[] srcRow, int srcPos, int srcWidth,
byte[] destRow, int destPos,
int samplesPerPixel, int bitsPerSample, int samplePeriod) {
Validate.isTrue(samplePeriod > 1, "samplePeriod must be > 1"); // Period == 1 could be a no-op...
// Period == 1 is a no-op...
if (samplePeriod == 1) {
return;
}
Validate.isTrue(samplePeriod > 1, "samplePeriod must be > 1");
Validate.isTrue(bitsPerSample > 0 && bitsPerSample <= 8 && (bitsPerSample == 1 || bitsPerSample % 2 == 0),
"bitsPerSample must be > 0 and <= 8 and a power of 2");
Validate.isTrue(samplesPerPixel > 0, "samplesPerPixel must be > 0");
@@ -261,7 +266,12 @@ public final class IIOUtil {
public static void subsampleRow(short[] srcRow, int srcPos, int srcWidth,
short[] destRow, int destPos,
int samplesPerPixel, int bitsPerSample, int samplePeriod) {
Validate.isTrue(samplePeriod > 1, "samplePeriod must be > 1"); // Period == 1 could be a no-op...
// Period == 1 is a no-op...
if (samplePeriod == 1) {
return;
}
Validate.isTrue(samplePeriod > 1, "samplePeriod must be > 1");
Validate.isTrue(bitsPerSample > 0 && bitsPerSample <= 16 && (bitsPerSample == 1 || bitsPerSample % 2 == 0),
"bitsPerSample must be > 0 and <= 16 and a power of 2");
Validate.isTrue(samplesPerPixel > 0, "samplesPerPixel must be > 0");
@@ -278,7 +288,12 @@ public final class IIOUtil {
public static void subsampleRow(int[] srcRow, int srcPos, int srcWidth,
int[] destRow, int destPos,
int samplesPerPixel, int bitsPerSample, int samplePeriod) {
Validate.isTrue(samplePeriod > 1, "samplePeriod must be > 1"); // Period == 1 could be a no-op...
// Period == 1 is a no-op...
if (samplePeriod == 1) {
return;
}
Validate.isTrue(samplePeriod > 1, "samplePeriod must be > 1");
Validate.isTrue(bitsPerSample > 0 && bitsPerSample <= 32 && (bitsPerSample == 1 || bitsPerSample % 2 == 0),
"bitsPerSample must be > 0 and <= 32 and a power of 2");
Validate.isTrue(samplesPerPixel > 0, "samplesPerPixel must be > 0");